Concrete step



Sept. 21, 1943.

E. A. ROGGE CONCRETE STEP Filed Dec. 9, 1941 2 Sheets-Shut 1 sepfl 1943-EA. ROGGE 2,330,148

CONCRETE STEP 4 Filed Dec 9. 1941 2 Sheets-Sheet 2 "III/III PatentedSept. 21 1943 UNITED STATES PATENT OFF'ICE CON C RETESTEP Edward A.Bogge, Marinette, Wis. Application December 9, 1941, Serial No. 422,291

ain (o1; ra -9s) This invention relates torastep or stair con-'struction, and more particularly to a precast concrete step or stair.

An object of this invention is to'provide a-stair construction which canbe preformed in knock-' down form and set up easily and quicklyat thedesired location.

Another object. of this invention is to provide, a stair constructionwhereina treadis cast integralwith a riser and each tread at ther'earthereof is formed with a locking lug forJengagement with a succeedingriser. l

A further object of this invention is to provide in a stairrof this kinda removable plug for receiving a rail supporting post. 1

A further object of this invention is to provide a stair of this kindwhich is so constructedv that it is self-supporting, so that it maybeset up on the exterior or interior ofzra building :at 7| the desiredlocation. a e

To the-foregoing objectsand others 4 which may hereinafter appear, theinvention consists of the novel construction, combination andarrangement of parts as will be more specifically referred toandillustrated in the accompanying drawings, but it is to be understoodthat changes,

variationsand modifications may be resorted to which fall within asclaimed;

In the drawings: a I

the scope of the invention Figure 1 isa detail side elevation of-a'stairor-step structure constructed to- 'an embodiment of thisinvention,

- Figure 2 is a top the structure, Figure 3 is a sectional view taken ontheline 33 of Figure 2, t

Figure 4 is a sectional view taken on the line 4--4'of Figure 3, it

Figure 5 is a perspective view of one of the combined tread and risermembers,

Figure 6 is a fragmentary sectional view on the line 6-6 of Figure 3,and a a Figure 7 is a fragmentary sectional viewtaken on the line 1-1 ofFigure 6.

-Referring to the drawings the numerals. m. and II designate generally apair of vertically disposed or upright side members for supporting stairtreads in the desiredlocation with respect to a building. The twosupporting members l0- and H areof like construction and each in? cludesahorizontally disposed baseumember. l2:

which is preferably formed of concrete suitably reinforced by embeddedmetal elements or the like, and the base member l2 has cast integraltakendisposed. andforwardly extending tread supporting' member Il l.Thetread supporting member l4 has the upper surface thereof disposedinparallel relation with the basel2 so asto support a tread in :ahorizontal position. Each tread p -A relatively thin'panel supportingmember M has formed integral therewith a.depending downwardly, andforwardly extending supporting member 'lli. {The supportingmember-flfi'is inclined to thevertical, and the first supporting memberis formed integral with the base I 2 whereas'succeeding 'supportingmember-s 5 are formed integral with the tread supporting :members l4 andthe uprights l3. i

I6 is disposed between pairs "of uprights, l3 "and adjacent tread sup--portinggmembers [5! "These panels I6 are provided in orderto close thespace between the uprights l3. Y I 'Inorder to'provide a means wherebythe two side members I0 and ,H may be held in a vertical-position, Ihave-provideda pair of crossed orintrsetztingbracingmembers I I and-l8.The

plan partly broken away of Y a v i bracing members I! and I8, shown moreclearly in Figure -4 are each provided with flattened angularly disposedopposite end portions l9 which are adapted-to engage-inwardly projecting bolts Zflgwhich have the outeriportions there- 1 of embeddedin' theside members If! andl I; A nut 21 is threaded onto each bolt 20 so as totightly hold the bracing members I! and I8 in' operative position. Theupright ID at the rear portion thereof is formed with aninwardlyprojecting foot or base plate "22, and the side member' ll is alsoformed'with an inwardly projecting baseffoot23. The two-feet 22 and 23provide additional surface engaging means for the side members I 0 andII to prevent these sidev members from sinking into the ground 'or'othersurface. v r t p A' lowermost combined treadfand riser membergenerally designated as 7.24 is mo'untedon the forward or projectingend'portions' of the two base members l2. The-combined tread and risermember 24 includes a horizontallydisposed flat tread member 25 whichengages on the upper side'of the base members. l2 forwardly of p theforemost riser supporting or bracing member; l5, The-two base members l2areeach provided in their upper surface thereof with a V-shaped k way.or n c 26 i i w ich a V-shaped key 21, carried by and formed integralwith the tread member 25, is adapted to engage.

The keys 21 are adapted to hold the lowermost tread member 25 againstforward or rearward movement with respect to the base members l2. Eachbase member I2 at its forward end is formed with an inclined surface 28which is inclined to the vertical, being inclined upwardly andrearwardly, and a depending riser member 29 is formed integral with thetread member 25 and is adapted at its rear face to abut against theinclined faces or ends 28 of the two base members l2.

The riser member 29 is formed with a vertically disposed forward side orface 30, and with an inclined rear side or face 3| which is disposed onV w an angle coincident with the inclination of the forward ends 28 ofthe base members l2. tread member 25 adjacent the opposite end portionsthereof is formed with openings 32 within which removable plugs 33 areadapted to engage. The plug 33 may be formed out of concrete or thelike, and areprovided so that in the event the userof this stair desiresto secure side rails thereto, the plugsy33' may beforced out from thetread- 25, and a rail supporting post or the like may be secured at itslower end in the opening 32.

The tread member 25 at its rear edge is formed The r receive railsupporting posts or the like. In the use and construction of this stairstructure the two side members l0 and H may be constructed separately asindividual units, and as many of the combined tread and riser membersmaybe also precast to form the desired steps.

with a pair of rearwardly extending substantially The two lockingmembers 34 are disposed wardly from the opposite end portions of the.tread member a suflicient distance, so; that these locking members 34may engage against the inner sides of the upright members In and H andthereby hold. the: tread members'25 against endwise movement.

A succeeding combined tread and riser member 38 is adapted to engage thefirst tread supporting member l4 and, the: riser member 39 is adapted atits lower edge.- to engage in the. two channels 31 formed bythe lockingmembers 34 and the rear portion of, the; tread member 25. A tread member40 is formed integral with. the riser 39,.

' and rests upon the succeeding tread supporting.

member 14 following the treadmember 25.. The

rear edge portion of, the; tread member 25 isrformed 1* with a forwardlyofiset edge portion 41 which forms an open slot between the rear edge ofthe tread 25 and the forward side of the succeeding riser 35. The slot4| as shown in Figure 5 is disposedsbetween the two loclr. memberscarried bythetread member 25 and is designated for the purpose: ofdraining. water at the rear of each'tread. The

combined tread and riser member 38 is formed It willbe understood thatthere may be as The lowermost combined tread and riser member 24 isinitially mounted on the two spaced apart base members 12' after'theside members iO' and U have been secured: togetherin upright position bymeans of the two bracing members l1 and I3. The succeeding combinedtread and riser members 38 may then bemounted' onthefsucceeding treadsupporting. member l4. Thesesuceeding tread and riser members 38 willhave the riser portions-"i9 thereof. engaging in: preceding lockchannels, sothat the succeeding combinedtread and riser members will beheld against, movement relative to each other, and'the lowermost treadand riser member 24 will: not'only be held against movement relative: tothe succeeding tread and risermember 38', but will: also be held 1against forward onrearward movement relative to the two side members i0-and' H by engagement of the keys 21in. the keyways' 2ii;

The tread and riser members 38 at the rear edges are adapted to abutagainst the adjacent supporting members [5, and.a pair of lockingmembers 42 carried: :by each tread and riser member 38 will hold these'latter members against endwise movement: with respect to the sidemembers tit and H. In; like manner the 4 locking members 34 will holdthe lowermost com-' bined tread and riser member, 24' againstend wisemovement with respect. to the side members- In and H.

This stair construction as hereinbefore' statedmay be precast insuitable forms constructed for that purpose,. and can be easily,- andquickly set up in, the desired: location: without the: use of: anyplastic, concrete, or cement, By: forming: the combinedtread and risermembers insertible units, these tread and riser members "may be easilyreplaced-in the eventwtliey become broken or otherwise damaged. A- stairconstructed. according to thisi-nverrtion may be constructed at aconsiderably reduced cosmifrom-i an; ordinarily solid concrete stairorste'p'structure and at the same: time willprovide ifor theneces saryexpansion and contractiomofthe. material ing; fromthe' rear portion ofsaid base, and treadi: supportingcmeans: carriedi'by thewbase, saidtread' supporting: means comprising aseries. of stepped: inclined:supporting? membersr carrying; a series; of stepped horizontail treadsupporting: members;

combined tread and riser members seated on sai di tread supportingmembers; said combined new and riser members compri'sin'g wwedge-sh'aped downwardly tapering riser member and a hori- V zontaltread member integrally formed there with, said tread member having thecentral portion of its rear edge forwardly offset to provide a drainopening, a pair of spaced apart substantially L-shaped locking memberscarried by the rear edge of said tread member for engagement with thelower edge of the succeeding riser, and a pair of crossed brace memberseach extending from the upper rear portion of one of said upright sidemembers to the lower rear portion of the other of said side members.

2. A self-sustaining precast stair structure comprising a pair of castintegral upright side members, each of said side members having a groundsupported base member of a length substantially equal to the depth ofthe stair structure, a series of stepped horizontal supporting members,a series of upwardly and rearwardly inclined uprights carrying theforward portion of said horizontal supporting members, means forsupporting said uprights from said base memher, an inwardly extendingfoot carried by the lower rear edge of said base member, a pair ofcrossed brace members extending from the upper rear portions of saidside members to the opposite lower rear portions of said side members,and

